Muffle furnace



Nov) 24, 1931. p. 6 N 1,833,088

MUFFLE FURNAC E Filed Aug. 20, 1930 2 Sheets-Sheet l P. MQHRaNG Nov. 24,1931.

MUFFLE FURNACE Filed Aug. 20. 19:50

2 Silesia-Sheet. 2

d a J c a d Patented Nov. 24, 1931 UNITED STATES PATENT orrica ram: 1631mm, or man, 021mm, .assrenon r0 rnmn. new? mom scam, or ESSEN-ON-THE-BUHR, GERMANY IUFFLE FURNACE Application fled August 20, 1880, Serial No.

The invention relates to muflie' furnaces for high tem ratures in which the space of the mufiie is ounded by at least one wall of heat-rcsistin materiahand has for its object to afior very satisfactory tightening of the space of the muflie toward the heating flues of the furnace.

In order that the invention can be more readily understood. an embodiment of the same is illustrated by way of example in the accompanying drawings in WlllCll Fig. 1 is a longitudinal section through the furnace. along line l-1 of Fig. 3 viewed from the right,

Fig. 2 is a second longitudinal section through the furnace along line 2-2, hkewise viewed from the right,

Fig. 3 is a sectional view along line 3-3 of Fig. 1, viewed from the left,

Fig 4 is a sectional view along line 4--4 of Fi 1. also viewedfrom the left. and

Fig. 5 is a horizontal longitudinal section of the furnace along line 5-5 of Fig. 1, viewed from the top.

. Referring to the drawings. A denotes the masonry of the furnace and B the muffle. The floor of the mufile B preferably comprises two caps C. each curved in cross section in a three center arch and having end walls 0 The edges of these caps C extend nzarly or exactly horizontally and rest in longitudinal grooves a and a and in trans verse grooves a provided'in the masonry. The longitudinal walls of the mufiie are substantially formed each by the inner wall of a heating body D of U-shaped cross section and open on the underside, the ends of which bodies D are closed by front walls d. The edges of the bodies D extend likewise nearly or exactly horizontally, the inner longitudinal edges resting in the grooves (1 together with the edges of the caps C, while for their outer edges are provided grooves a and for the edges of the front walls at transverse grooves a. All of these grooves are filled with a powdered sealing material, such as quartz sand. The heating bodies D are suspended in known manner from the oven cover by means of hook bars E. The heating bodies D have 178,698, and in Germany November 9, 1989.

mounted on their inner side angle irons d on which rests a ate F whereon the articles to be heated are e osited. Each of the caps C covers a longitu inal op'en heating flue a. Each of the heating bodies D, at its front end, covers a flue a, by which the interiorof the heating body communicates with the corresponding longitudinal flue a, and at its rear end covers an exhaust flue a. In each body D are provided. in the manner to be seen from Figure 2 baflie plates G and a baflie plate H which cause the heating gases to flow in zigzag. The course of the heating gases is like wise to be seen from Figures 1, 2 and 5 and therefore need not be described in detail, the more so as it is immaterial for the present invention. The door of the furnace is designated by J.

It may be stated that rnufiie furnaces of the type described are already known in which the side walls of the muflie consist of a heatresisting metal and the longitudinal edges of these side walls engage grooves of the masonry filled with powdered quarts, while, however the end walls are bricked in the masonry. Now as the masonry and the heat-resisting metal expand in difierent degree upon the furnace being heated. it is verydifiicult to perm'anently keep tight the mufiie chamber against the heating fiues. As readily to be seen, this drawback is avoided by the described construction.

The idea of the invention of which the embodiment hereinbefore described is only an example, can be realized still in another manner. So, for instance, the heating bodies D can have such a height or such lateral inside extensions that also the roof of the furnace is heated.

What I claim and desire to secure by Letters Patent is 1. A muflle furnace having a hollow heating body of heat-resisting metal closed on all sides except the underside and forming at least one wall of the mufiie chamber, an open heating flue being provided in the masonry below and covered by, said heating body and an endless groove extending round the aperture of said flue, the lower edge of 2 Lesaoea said heating bod resting in said groove and said heatin body for depositing thereon the being sand-scale therein. articles to heat-treated.

2 Av mufile furnace having a hollow heat- The foregoing specification signed at lug body of heat-resisting metal clmd on logne, Germany, this 6th day of August, a S

ides except the underside and forming at 1930. least one wall of the mufide chamber, an open PAUL MClHRIN G. heating flue beingi provided in the masonry below and covere y, said heating body, an endless groove extending around the aperm ture of said flue, the lower edge of said heat- 75 ing bod resting in said groove and bein sand-sea ed therein and means for suspen ing said heating body from the oven cover.

3. A muflle furnace having a hollow heatin body of heat-resisting metal closed on all 80 si es except the underside, and forming at least one wall of the muflle chamber, an open heating flue being grovided in the masonry below and covered y, said heating body, at least one other open flue extending along said first-named flue in the masonry, an arched cap covering said other flue. grooves extending round the apertures of said flues, the lower edges of said heating body and of said ca resting, respectively, in said grooves and 90 being sand-sealed therein.

4. A muffle furnace having a hollow heating body of heat-resisting metal closed on all sides except the underside and forming at least one wall of the muflle chamber, an open as heating flue being rovided in the masonry below and covered y, said heating body, at least one other open flue extending along said first-named flue in the masonry, an arched 3a cap covering said other due, a common end- 100 less groove extending round and between the apertures of said flues, the lower edges of said heating body and of said can resting in said groove and being sand-sealed therein. 5. A muflie furnace having two hollow 105 heating bodies of heat-resisting metal extending laterally of the furnace so as to form each at least one side wall of the muifle chamber and closed on all sides except the underside, two open heating flues being provided in the 1.10

masonry below and covered, respectively. by, said heating bodies, two other heating flues extending, respectively, along said firstnamed flues in the masonry, arched caps each covering said other flues, an endless groove Y extending round and between the apertures i of each of said first-named flues and the adjacent other flue the lower edges of the respective heating body and cap resting in said i as grooves and being sand-sealed therein.

6. A mufile furnace having a hollow heating body of heat-resisting metal closed on all sides except the underside and forming at least one wall of the muflie chamber, an 60 open heating flue being provided in the masonry below and covered by, said heating body, and endless groove extending round the aperture of said flue, the lower edge of said heating bodv resting in said groove and being sand-sealed therein, and means fixed on 12o 

